Parameter description
protocol
Performance
Menu
3
Parameter
structure
Keypad
and
format
Advanced
parameter
descriptions
Serial
comms
5.4
Menu
3:
Speed
feedback
and
speed
control
Speed
accuracy
and
resolution
Digital
reference
resolution
When
a
preset
speed
is
used
the
reference
resolution
is
0.1
rpm.
Improved
resolution
can
be
obtained
by
using
the
precision
reference
(0.001
rpm).
Analog
reference
resolution
The
analog
input
has
a
maximum
resolution
of
14bits
plus
sign.
The
resolution
of
the
reference
from
analog
inputs
2
or
3
is
10bits
plus
sign.
Analog
feedback
resolution
The
resolution
for
both
Armature
voltage
and
tachometer
feedback
is
10bit
plus
sign.
Accuracy
With
encoder
feedback
the
absolute
speed
accuracy
depends
on
the
accuracy
of
the
crystal
used
with
the
drive
microprocessor.
The
accuracy
of
the
crystal
is
100ppm,
and
so
the
absolute
speed
accuracy
is
100ppm
(0.01
%)
of
the
reference,
when
a
preset
speed
is
used.
If
an
analog
input
is
used
the
absolute
accuracy
is
further
limited
by
the
absolute
accuracy
and
non-linearity
of
the
analog
input.
If
analog
feedback
is
used
the
accuracy
is
even
further
limited.
Mentor
MP
Advanced
User
Guide
41
Issue
Number:
4
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